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Figure 4-18: Sub-menu for editing transient recharge concentration data.

Prescribed Head. Check the radio box next to ‘Prescribed Head:’ to treat the zone as a prescribed head
boundary condition. The head can be assigned as:

• a constant value that does not change with time – select the radio button next to ‘Constant:’ and
enter the desired value;
• a constant value that is time-varying – after selecting the radio button next to ‘Constant:’, check
the radio box next to the ‘Transient’ button
• the aquifer top elevation minus some prescribed value; by default, the stage is set to the aquifer
top elevation, as indicated by the value of zero in the text box next to ‘Top E – ’ shown in Figure
4-16Figure 4-13.

To assign time-varying recharge, check the radio box next to the ‘Transient’ button, and then LM click the
‘Transient button. This opens the ‘Transient Data for Recharge’ sub-menu (see Figure 4-19). Indicate the
starting data and time with the text boxes next to ‘State Date’ (year, month, day, hour). Then, provide the
following inputs for each timestep: TimeN – or the number of days since the starting date and time; and
ValueN – the head value corresponding to TimeN. The head values may be entered in any units; however,
if meters are not used, make sure to enter the appropriate multiplier in the text box next to ‘Multiplier to
meter:’. After all desired changes have been made, LM click the ‘OK’ button. Or click ‘Cancel’ to discard
all changes and close the sub-menu.

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